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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-006
ENGINE FUEL FEED - MAIN TANK NO. 2 FORWARD AND AFT BOOST PUMPS
ENGINE FUEL FEED - MAIN TANK NO. 2 FORWARD AND AFT BOOST PUMPS
EFFECTIVITY
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D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-006
General
This page shows control of the left forward boost pump. Control
of the left aft, right forward, and right aft boost pump is almost
the same.
Left Forward Boost Pump Control
The tank 1 forward boost pump switch controls the tank 1
forward boost pump relay. The tank 1 forward boost pump relay
controls power to the left forward boost pump.
With the switch in the ON position, 115v ac power goes to the
relay. With the relay energized, power goes from the 115v ac
transfer bus to the left forward boost pump.
With the switch in the OFF position, the relay no longer receives
115v ac power. With the relay not energized, the left forward
boost pump no longer receives power.
Pressure Indication
A LOW PRESSURE light comes on when the tank No. 1 forward
boost pump pressure is 6 psig or less.
ENGINE FUEL FEED - FUNCTIONAL DESCRIPTION - FORWARD AND AFT BOOST PUMP
EFFECTIVITY
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Page 20
D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-007
ENGINE FUEL FEED - FUNCTIONAL DESCRIPTION - FORWARD AND AFT BOOST PUMP
ENGINE FUEL FEED - FUNCTIONAL DESCRIPTION - FORWARD AND AFT BOOST PUMP
EFFECTIVITY
GUN ALL 28-22-00
Page 21
D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-007
General
The crossfeed valve lets fuel flow between the left and right
engine fuel feed manifolds. With the connection of the two
engine fuel feed manifolds, one fuel tank supplies fuel to both
engines.
Location
The fuel crossfeed valve is on the right wing rear spar. Access
is through the right wheel well.
Motor Actuated Valve
The motor actuated valve has these parts:
* Valve body
* Adapter and shaft
* Actuator.
Valve Body
The valve body connects to the left and right engine fuel feed
manifold. The valve body has an operating shaft and a butterfly
valve (not shown). There are no hard stops for the butterfly
valve. The alignment marks show valve position.
Adapter and Shaft
The adapter and shaft attaches between the rear spar and the
operating shaft. The adapter has a mount plate and an actuator
adapter plate.
The mount plate attaches to the rear spar. The actuator adapter
plate attaches to the mount plate with adjustment screws. You
loosen the adjustment screws to rotate the actuator adapter
plate. You turn the actuator adapter plate to align the butterfly
valve with the actuator.
Actuator
The actuator is a 28v dc motor. It has a manual override lever
that permits valve operation without electrical power. The lever
aligns with valve position indicators on the adapter. This shows
valve position.
The fuel crossfeed valve actuator is interchangeable with the
engine fuel spar valve actuator.
ENGINE FUEL FEED - FUEL CROSSFEED VALVE
EFFECTIVITY
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D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-008
ENGINE FUEL FEED - FUEL CROSSFEED VALVE
ENGINE FUEL FEED - FUEL CROSSFEED VALVE
EFFECTIVITY
GUN ALL 28-22-00
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D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-008
General
The fuel crossfeed valve switch controls the crossfeed valve.
When you move the switch to the open or closed position, 28v
dc power goes through a switch assembly to the actuator. The
actuator then moves the crossfeed valve to the applicable
position.
The printed circuit card assembly controls the operation of the
crossfeed valve open light. The printed circuit assembly
receives fuel crossfeed valve position and fuel crossfeed
valve switch position information.
When the fuel crossfeed valve is closed, the crossfeed valve
open light is off. When the fuel crossfeed valve position and fuel
crossfeed valve switch position disagree, the crossfeed valve
　
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